A guild is like a team, except it isn't disbanded when all players log out. It was an unused concept in LU. It has a leader, and all of the members. They have private chat, and a leader can kick someone out or disband the guild at any time. Guild leaders can name the guild once it's created. Players in a guild will be able to see which other players in their guild are online and which world they're in. In order to create a guild, they would have to talk to the Guild Master, who is located in Nexus H.Q.
If a developer accepts this idea, they can change anything they wish.